You can infer there is a big population of sierra leone
As of 2013 the population of sierra leone is 6.092 million and is increasing.
One big reason for this is because individuals of the same species often have to fight over shared resources (this means shared food and shared environment).
Because they fight over a limited amount of space and food, competition between individuals within one species can be present and very tough.
On the other hand, having members of different species also possibly means different territories and different food sources. A lion has no quarrel with dolphins, while it can have a lot of fights with lions from different prides (large group of lions).
Water is a key element and necessary thing life needs in order to live and thrive without water everything would die.